<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script>
        window.onload = function () {

            var eleNode = document.getElementsByTagName("img")[0];

            //属性、赋值获取两种方式
            //1.元素节点.属性或者元素节点[属性]
            eleNode.src = "image/jd2.png";
            eleNode.aaa = "bbb";
            console.log(eleNode.aaa);
            console.log(eleNode.src);
            console.log(eleNode.tagName);
            console.log(eleNode["title"]);
            console.log(eleNode["className"]);
            console.log(eleNode["alt"]);

            //2.元素节点.方法();
            console.log(eleNode.getAttribute("id"));
            eleNode.setAttribute("id","你好");
            eleNode.setAttribute("ccc","ddd");

            eleNode.removeAttribute("id");
        }
    </script>
</head>
<body>
<img src="image/jd1.png" class="box" title="图片" alt="京东狗" id="aaa"/>
</body>
</html>